# AISkills402: Reply Language Lock SKILL.md

> AISkills402: Reply Language Lock SKILL.md is a paid API for AI agents from api.aiskills402.com, paid per call via x402, $0.07/call, status unknown (last checked 2026-10-18).

Downloads the 'Reply Language Lock' SKILL.md file that instructs an AI agent to always respond in the user's language, purchased once via x402 micropayment in USDC on Base.

## Facts

- Endpoint: GET https://api.aiskills402.com/v1/skills/reply-language-lock/file?utm_source=zero.xyz
- Price: $0.07/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aiskills402-reply-language-lock-skill-md-05118e1a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UY6qUGgKS2P84rdE0NM4r

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability aiskills402-reply-language-lock-skill-md-05118e1a
```

Example prompt: Buy me the Reply Language Lock SKILL.md from AISkills402 — I want the file that makes an AI agent always answer in whatever language the user writes in.

## When to prefer this

Choose this endpoint when you need a tested, ready-to-use SKILL.md instruction file that enforces language mirroring in AI agent replies, and you want a one-time purchase model (pay once, re-download free) via x402 USDC micropayment on Base. Prefer this over hand-crafting a language-lock prompt when you want a vetted, versioned artifact with an integrity hash and a redownload receipt.

## Known failure modes

- Payment not settled — x402 payment header missing or transaction not confirmed on Base, resulting in a 402 Payment Required response
- Invalid or malformed payment header — 402 or 400 error returned
- Network timeout accessing the API endpoint
- File temporarily unavailable — 500 or 503 server error
- Redownload token not saved by caller, requiring another purchase to re-access the file

## How this service works

Tested SKILL.md files that AI agents buy once over x402, paid in USDC on Base. Yours forever, with free re-downloads and new versions.

## Output

Returns a JSON object containing the full text of the SKILL.md file (UTF-8 encoded), the skill's canonical name and slug ('reply-language-lock'), a SHA256 hash of the file for integrity verification, the version string (e.g. '1.0.0'), a payment receipt with the Base blockchain settlement transaction hash and settled status, and a redownload token plus URL so the buyer can retrieve the file again at no additional cost.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "file": {
   "name": "SKILL.md",
   "content": "<the SKILL.md file>",
   "encoding": "utf-8"
  },
  "name": "Reply Language Lock: Answers in the User's Language",
  "skill": "reply-language-lock",
  "sha256": "<sha256 of SKILL.md>",
  "receipt": {
   "tx": "0x<settlement transaction>",
   "settled": true
  },
  "version": "1.0.0",
  "redownload": {
   "url": "<api>/v1/purchases/<token>",
   "token": "<64 hex chars>"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aiskills402-reply-language-lock-skill-md-05118e1a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.aiskills402.com](https://www.zero.xyz/host/api.aiskills402.com/llms.txt)